chore(vendor): import pi 0.85.1

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/coding-agent/examples/extensions/reload-runtime.ts

@@ -0,0 +1,37 @@
+/**
+ * Reload Runtime Extension
+ *
+ * Demonstrates ctx.reload() from ExtensionCommandContext and an LLM-callable
+ * tool that queues a follow-up command to trigger reload.
+ */
+
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+import { Type } from "typebox";
+
+export default function (pi: ExtensionAPI) {
+	// Command entrypoint for reload.
+	// Treat reload as terminal for this handler.
+	pi.registerCommand("reload-runtime", {
+		description: "Reload extensions, skills, prompts, themes, and context files",
+		handler: async (_args, ctx) => {
+			await ctx.reload();
+			return;
+		},
+	});
+
+	// LLM-callable tool. Tools get ExtensionContext, so they cannot call ctx.reload() directly.
+	// Instead, queue a follow-up user command that executes the command above.
+	pi.registerTool({
+		name: "reload_runtime",
+		label: "Reload Runtime",
+		description: "Reload extensions, skills, prompts, themes, and context files",
+		parameters: Type.Object({}),
+		async execute() {
+			pi.sendUserMessage("/reload-runtime", { deliverAs: "followUp" });
+			return {
+				content: [{ type: "text", text: "Queued /reload-runtime as a follow-up command." }],
+				details: {},
+			};
+		},
+	});
+}